It sounds very similar to the Dallas Makerspace. They have been up an running for a little over a year now and they have already gone through the pain of finding a location, dealing with code and permits, cost of membership, insurance, and all of the ugly little details necessary to make something like this work and be safe and legal. Assuming that your goals are not the same as Dallas Makerspace's (this seems more focused on creativity whereas Makerspace is more focused on building things, a subtle yet perhaps important distinction), contacting them would probably be worth while to see what sorts of lessons learned you can glean. Fort Worth is also in the process of setting up a similar space called the Fort Worth Make Space. They are currently organizing and might have a similar set of lessons learned to help move this along. There is no sense in completely reinventing the wheel when setting something like this up.

We love Dallas Makerspace and talked to them about this for a while. I was actually an early member of their space, and I'm a founding member of two other well-regarded hackerspaces, so we're intimately familiar with the challenges faced starting an organization like this. I've also recently contacted Fort Worth Makerspace to try to help them since we've already done a lot of the grunt work.

You're right, we're more broadly focused on creating, which does include building, and we have a much larger, more urban location in mind. We also are really interested in getting people involved in the greater Dallas community as much as possible, rather than just keeping our members in our space all the time, whether that be the makerspaces, incubators, manufacturing, or galleries. Looking forward to it!